Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*A

Main Body ECU (Multiplex Network Body ECU) with 1 Connector

-

-

*A

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

-

-

(a) Disconnect the main body ECU (multiplex network body ECU) connectors.

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(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-32 (IG) - Body ground

-

Ignition power supply (IG signal)

Ignition switch ON → off

11 to 14 V → Below 1 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Ignition switch ACC → off

11 to 14 V → Below 1 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-18 (DBKL) - Body ground

-

Driver seat belt buckle switch signal

Driver seat belt fastened

10 kΩ or higher

Driver seat belt unfastened

Below 1 Ω

MB-2 (RCTY) - Body ground

-

Rear door courtesy light switch RH input

Rear door LH closed (OFF)

10 kΩ or higher

Rear door LH open (ON)

Below 1 Ω

MB-13 (LCTY) - Body ground

-

Rear door courtesy light switch LH input

Rear door RH closed (OFF)

10 kΩ or higher

Rear door RH open (ON)

Below 1 Ω

CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the F4 combination meter assembly connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F4-40 (B) - Body ground

SB - Body ground

Battery power supply

Always

11 to 14 V

F4-39 (IG+) - Body ground

P - Body ground

IG power supply

Ignition switch ON → off

11 to 14 V → Below 1 V

F4-21 (ET) - Body ground

W- B - Body ground

Ground

Always

Below 1 Ω

F4-7 (PKBI) - Body ground

GR - Body ground

Front passenger seat belt buckle switch signal

Ignition switch ON, front passenger side seat belt fastened and front passenger seat occupied

10 kΩ or higher

Ignition switch ON, front passenger side seat belt unfastened and front passenger seat occupied

Below 1 Ω

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